Schleicher ASK 18

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The Schleicher ASK 18 is a single-seat sailplane that was built by the German manufacturer Alexander Schleicher GmbH & Co. It was designed to be a sturdy aircraft for inexperienced solo pilots and so uses a simple and rugged construction and has docile handling characteristics.

Design

The ASK 18 was designed by Rudolf Kaiser and was the last Schleicher glider to use the traditional construction method, at a time when contemporary aircraft of the same class, such as the Grob G-102 Astir, were made of glass-fibre. The fuselage was derived from the Ka 8 and used welded steel tube and spruce longerons. It is covered in fabric. The wings are from the Ka 6E but with 16-metre span. They have a single wooden spar. The rear part of the wing is fabric-covered and the ailerons are plywood-covered. The tailplane came from the K 10; the fin and tailplane are plywood-covered and the rudder and elevators are fabric covered. A Flettner trim tab is fitted to the elevator. Only the nose cone is glass-fibre. The main-wheel is fixed and has a brake. There is a tail-skid but no nose-skid. The Schempp-Hirth airbrakes extend above and below the wing. First flight was in October 1974.

A variation was the ASK 18B which had a span reduced to 15m. At the end of production in 1977 38 K18s and 9 K18Bs had been built by Schleicher and one unknown variant built from a kit. A further 8 K18-ARs were produced in Argentina.

Specifications

ASK 18 launching at Camphill

General characteristics

Crew: One
Length: 6.00 m (19 ft 8 in)
Wingspan: 16.00 m (52 ft 6 in)
Height: 1.68 m (5 ft 6 in)
Wing area: 13.0 m² (140 ft²)
Aspect ratio: 19.7
Wing profile: Root: NACA 633-618 Mid: NACA 633-614 (with Wortmann leading edge modification)
Empty weight: 215 kg (473 lb)
Gross weight: 335 kg (737 lb)

Performance

Maximum speed: 200 km/h (125 mph)
Maximum glide ratio: 34
Rate of sink: 0.62 m/s (122 ft/min)

References

Gliders and Sailplanes of the World by Michael Hardy Ian Allan Ltd 1982 ISBN 0-7110-1152-4

External links

Wikimedia Commons has media related to ASK 18.

Sailplane directory

v t e Schleicher glider types

Wooden construction	Condor Hols der Teufel Moagazotl Poppenhausen Rhönadler Rhönbussard

Wooden construction (Rudolf Kaiser)	Ka 1 Rhönlaus Ka 2 Rhönschwalbe Ka 4 Rhönlerche II Ka 6 Rhönsegler K7 K 8 K 10 ASK 12 ASK 13 ASK 14 ASK 16 ASK 18

GRP construction (Rudolf Kaiser)	ASK 21 ASK 23

GRP construction (Gerhard Waibel)	ASW 12 ASW 15 ASW 17 ASW 19 ASW 20 ASW 22 ASW 24 ASW 27 ASW 28

GRP construction (Martin Heide)	ASH 25 ASH 26 ASH 30 ASH 31

GRP construction (Michael Greiner)	ASG 29

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Schleicher ASK 18

Design

Specifications

See also

References

External links